How did the positions of Zwingli and Luther on the sacrament of the Lord’s Supper differ?

Must answer the questions: How did the positions of Zwingli and Luther on the sacrament of the Lord’s Supper differ? What was the purpose of this debate? Based on this example, why do you think reformations debates led to further hostility rather than compromise and unity between religious and sectarian opponents? What implications did this have for the future of the Protestant Reformation?